Malicious PDF — malware analysis report

Static analysis result for SHA-256 3650915aa10736a4…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 00:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e937e25cffe7703f4b8090128da7f308 SHA-1: 873d15f817fe522f509d060e32281694ce1b7ea5 SHA-256: 3650915aa10736a489e80de97883b2f9275f6ec60b2c8bebbf3fab7f755ed363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=android+10+user+manual PDF link annotation
    • http://hostingureitings.lv/uploads/userfiles/files/16051812947.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/499887627.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/kevojevoseveto.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/20227443404.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/65771136821.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/pidawagipizavalejofotajo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/31d8c4b6f14cff80f46aee0a78691960/faxeduziputexese.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1c92ea9---mazaxegevogorerazufediju.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/85225780466.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/90185740992.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc2b0368e---20878149790.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/78599291755.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/bonokapakimuzul.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2e0bf41f575a7eb66363b51eac6290ce/58117098106.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/2077675193.pdfIn PDF document text
    • http://humanlitech.com/files/files/19659980142.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/3963281720.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fuvipedipumalupanuxonu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/53c4721c686e8ba3ffb796fb95a5912f/sexanelegaf.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/fususuzil.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_132355.pdfIn PDF document text
    • http://kaies.net/upfiles/file/59083333262.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/bejiwope.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 10568 bytes
SHA-256: 81c9fdb4fade7c529e28e33706ee591d9d7bcd92b8b4ed0f99c33833ccf466c3
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 17996 bytes
SHA-256: c56b2bb8e6b6d74b47178d7c1514d25d833ec3db2b2d91dd391b4a50f4eccd69